Wang’s basis

There is no direct coupling between lb = + 2 and lb = - 2 because of the selection rule (4.128). The values of a, and a2 are obtained by using the equations of the previous sections and are given in general in terms of qu, q22, quin view of the special form of the rotation-vibration matrices, it is convenient to introduce a transformed basis (Wang s basis, 1929 see also Herman et al., 1991 Holland et al., 1992), defined as... 

The transformed basis, often referred to as Wang s basis [87], is defined as... 

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See also in sourсe #XX -- [ ]

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